Legend:

Another reason which I just thought about: The argument in the Tor Browser design documentation assumes that the user in question leaves everything in the Tor Browser by default. But there's no guarantee for that, and in real life many users make themselves more fingerprintable (e.g. by changing the browser's size, ...etc). In such a case, blocking some trackers may turn out to be beneficial, if only to prevent some trackers from easily fingerprinting some users.

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The other counter-argument that this would damage ad revenue from websites ignores that there's only 2 million TB users, and the impact would be relatively tiny.

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The other counter-argument that this would damage ad revenue from websites ignores that there's only 2 million TB users, and the impact would be relatively tiny. Also many major browsers are now starting to block (some) ads by default, such as Brave, Opera, ... and even Google's Chrome which will block some certain types of ads in 2018.